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    Average IQs

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    The average IQ is 100. What percentage of people have IQs between 80 and 120. (IQ is normally distributed with mean 100, SD=15)

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    https://brainmass.com/statistics/probability/psychology-statistics-percentages-15443

    Solution Preview

    Compute Z and use the standard normal distribution table. Please see attached.

    First compute Z corresponding to the IQ 80 and 120 from Z=(IQ-mean)/sigma.

    Then, Z at 80 = (80-100)/15 = ...

    Solution Summary

    The average IQ is 100. What percentage of people have IQs between 80 and 120. (IQ is normally distributed with mean 100, SD=15)

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